Means for supplying water to the pistons of gas-engines.



PATENTED DEG. 1h 1903.

-H. RICHTER. MEANS FOR SUPPLYING WATER T0 THE PISTONS 0F GAS ENGINES.

f APPLICATION FILED JULY 9| 1903.

H0 MODEL.

WERNNW El (Ni/ENTOH" W/ TNSES me Mums PETERS co.. Puomumn., wmlysron. mc,

UNITED STATES 'reinem-.en December i, 190s.

PAT-ENT OFFICE.

HANS RICHTER, OF NUREMBERG, GERMANY.'

SPECIFICATION'forming part of Letters Patent No. 745,669, dated December 1, 1903. Application led July 9, 1903- Serial No. 164.366. (No model.)

T0 au whom t may concern:

Be it known that I, HANS RICHTER, engineer, a subject of the German Emperor, residing at Nuremberg, in the Empire of Germany, (whose full postal address is Gieisbiihlstrasse 15, Nuremberg aforesad,) have invented certain new and useful Improvements in Means for Supplying Water to the Pistons of Gas- Engines, of which the following is a specification.

In gas-engines the piston of which have a water-cooling arrangement the supply and removal of the cooling-water frequently take place through the interior of a pipe inserted in the hollow piston-rod, as well as through an annular chamber between this" inserted pipe and the inner face ofthe piston-rod, the inserted pipe and the annular chamber each communicating with a hollow part of the cross-head, (or of one cross-head where the e'ngine has several.) In this arrangement acceleration and retardation pressures are experienced by the mass of water contained in the moving parts of the machine, which pressores are of a somewhat considerable amount at the ends of the stroke, but are almost mi in the center of each stroke and then change their direction. The water is thus during each two succeeding halfstrokes,which take place before and after one dead-point of the engine, pressed toward the piston, which isA not deleterious if the means for supplying and carrying od the water is slots on the slideface of the cross-head. In the next two halfstrokes, which take place before and after the other dead-points, the water is, however, accelerated or retarded in a reverse directionthat is to say, pressed toward the crosshead. Even if then theslots in the crosshead are in communication with the passages for supplying and carrying oi the water arranged in the cross-head slideway the pump must permanently produce a similar or even greater pressure corresponding to the greatest acceleration produced in order that the water column in the interior of the pump-rod should not be broken and subsequently under the action of the opposite acceleration and the pressure of the outside air brought together again with great force. In order to avoid such water-hammers, by the present invention the connection of the Water in the piston-rod and in the cross-head with the outer cooling-water pipe is interrupted during the period of the dangerous acceleration and retardation pressure, which action is attained by means of a peculiar arrangement of the slots on the under face of a cross-head and on the slideway of the same.

The whole arrangement of a gas-'engine in which the water-supply to the piston-cooling chamber takes place in the improved manner is shown in Figure I of the accompanying drawings, while Figs. II and III show the details of the rear cross-head ci; serving for the lvi/ater-supply, and its slideway b, while Figs. IV,V, VI, and VII are diagrams showwhile theother, j", is permanently in communication with an annular ehainbert between this insertion-pipe h and the inner face of the piston-rod g. The passages c and dior supplying and discharging the water end at the cross-head slide-plate in two short slots It and Z, arranged in proximity to each other, which slots correspond with larger longitudinal slots fm anda, arranged on the under face of the cross-head. So long as the slots lo and Z are kept open the water flows from the passage c through the slots lo and fm into the hollow chamber e of the cross-head a, thence into the inserted pipe 71, then into the piston-cooling chamber o, then into the annularspacec' between the piston-rod g and the insertionpipe h, and nally ilows away through the Yhollow chamber f of the cross-head a, the

slots Z and n, and the passage d of the slideway b.

From the middle of the forward stroke (the ldirection of which is indicated in the drawings by the yarrow V) there is a retardation of the masses connected with the pist-on and duri-ng the first haii' of the return stroke (the IOO direction of which is indicated in Fig. I by the arrow R) an acceleration of the masses rigidly connected with the piston takes place, and consequently the 'water is pressed in the direction toward the front wallp of the piston. As this pressure is not deleterious, the Water-inoW may take place in the manner hereinbefore described during the continuation of the tWo half-strokes in question. At the commencement of this period of Water introduction in the middle of the forward stroke the slots m and n in the cross-head lie in the position shown in Fig. IV, in the front deadpoint they lie in the position shown in Fig. V, and in the middle of the return stroke they again lie in the position shown in Fig. A

IV over the slots k and Z in the slideway. It is thus seen that the Water always has the same size of passage afforded it.

From the middle of the return stroke to the middle of the next forward stroke a retardation and an acceleration, respectively, of the masses rigidly connected with the piston takes place by the Water being forced to the rear side of the cross-head a and tending to emerge to the outside through the slots in the said cross-head. In order to avoid the danger resulting therefrom of a Water-hammer in the piston, at the commencement of the second half of the return stroke, as shown in Fig. VI, the slots 7c and l Will close the inlet and outlet passages c and d of the slideway, and to a similar extent a rectangular upper opening of a cross-passage q, also arranged in the slide- Way,is exposed. The water circulating inside the hollow chambers of the moved parts of the machine consequently continues its movement in such a Way that the Water discharged from the lower slot n of the cross-head is conveyed through the cross-passage q to the slot m ofthe cross-head-that is to say, it remains uniform size are available for the flow of the circulating Water, Aas may be seen more particularly in Fig. VII, corresponding to the rear position of the cross-head, any shock is avoided.

Having noW particularly described and ascertained the natu re of the said invention and in what manner the same is to be performed, as communicated to me by my foreign correspondents, I declare that what I claim is l. In combination, with a piston of a gasengine, a slideway,a cross-head moving thereon, a piston-rod connecting the cross-head and piston, said cross-head having chambers e andf therein and slots mand n through its Wall, said slideway having passages c and d communicating with the said slots and having a cross-channel q to place the chambers e and fin communication, substantially as described.

2. In combination, a piston a cross-head connected With the interiorof the piston, said cross-head having the elongated slots fm, n, and a slideway for the said cross-head having slots 7c and l and supply and discharge passages c and d connected With said slots and a cross-channel q, said slots k and Z and the cross-channel q being arranged to connect with slots m and n of the cross-head.

In Witness whereof I have hereunto set my hand in presence of two Witnesses.

HANS RICHTER. 

